Core oven



May 12, 1931. w, v, BAKER 1,805,029 7 I cons OVEN Filed June 15 1927 4Sheets-Sheet 1 EE I15! w. v. BAKER May' 12,1931.

coma OVEN Filed June15, 1927 4 Sheets-Sheet 2' Patented May 12, 1931UNITED STATES WEDWOB'IH V. BAKER, OF DETROIT, MICHIGAN CORE OVENApplication filed June 15, 1927. Serial No. 198,909.

The present invention pertains to a novel oven designed particularly forbaklng cores to be used incasting operations.

The principalobject of the invention is I to provide a device of thischaracter in which the cores may be circulated up and down. the ovenuntil the baking operationis completed. Obviously, the same constructionis suitable for use. in connection with other articles requiring asimilarheat treatment and is not necessarily limited to the baking'ofcores. f

The device of the invention comprises essentially a vertical core ovenin which are mounted an ascending and a descending column of carriersadapted to support the grids on which are placed the articles to bebaked. Elevators are mounted beneath the columns and'are operated tomove together in the same direction. Column supporting elements actuatedby the movement of the carriers and elevators retain the ascendingcolumn and release the descending column when the elevators descend.Thus, the descending column drops to a level below that of the ascendingcolumn and acarrier is shifted from the bottom of the descend ing columnto the bottom of the ascend ing column while at the same. time a carrieris transferred from the top of the. ascending column to the top of thedescending column. Automatic rams are provided for transferring theuppermost and lowermost carriers in the manner stated and are preferablysynchronized with the elevators. Thus, the articles to be baked aremoved in a continuous cycle up and down the furnace. 'They are removedfrom the furnace after having been retained therein for the properinterval and are replaced by fresh articles which are to receive thesame treatment.

The invention is fully disclosed byway of examplein the followingdescription and in'the accompanying drawings, in which.

Figure 1 is avertical section of the de- Vice;

Fig. is a detail vertical section of the lower end of the device takenat right angles to Figure 1" on the line 2-2 of Figure 1;

Fig. 3is a horizontalsection on the line 33 of Figure 1;

Fig. 4 is a perspective view of one ofthe carriers;

Fig. 5 is a plane section; Fig. 6 is a section on the line 66 ofFigure5; and V 3 Figs. 7, 8 and 9 are diagrammatic views showing themovement of the carriers.

Reference to these views will now be made i by use of like characterswhich are employed to designate corresponding parts throughout.

On a suitable foundation 1 are erected more clearly in Figures 5 and'6.Horizontal channel members 5 are supported in suitable fashion upon themembers 1, and the channels 5 in conjunction'with the requiredadditional frame structure, supporta furnace wall 6 forming a verticalenclosure over the girders 2 and 8.

A baflie 7 is mounted between the intermediate girders and forms twovertical compartments or chambers 8 and 9. A series of legs 10 arearranged in parallel lines running through both chambers Sand 9, andthese legs support a roller table consisting of rails 11 mounted uponthe upper ends of the legs and having roller members 12 journaledtherebetween. Thus, a continuous roller table extends through bothcompartments. I a

In the foundation 1 is formed a well 13 containing elevators 14 and "15beneath the sliding rod 16 over which are laid a pair of contiguousI-beams 17 supporting another pair of I-members 18 at the ends thereof.

The latter members however are disposed at opposite sides of the rollertable in order that'they may be moved upwardly beyond the height of thetable and the members 17 are permittedto movebetween the legs 10. Eachofthe chambers 8 and 9 supports a detent.

vertical series of carriers of the type shown in Figure 4. Each carrierconsists of a pair of spaced side members 19 having their up per cornersjoined by parallel bars 20. Ledges 21 are formed inwardly of the lowerlongitudinal edges of the side members for the purpose of supportingtrays or gratings 22. The tops of the side members are formed withlongitudinal ridges 23, and the bottoms of these members are formed withcorresponding grooves 24 for the purpose described below. Further, theouter faces of the lateral members are sloped upwardly and inwardly asindicated by the numeral 25 in Figures 4 and 6.

Bearings 27 are fixed to opposite sides of the members 4, and similarbearings 28 are 11 )ported in alignment therewith by suitable clampingdevices 29 securing them to the corner girders 2. Between these pairs ofhearings are jo'urnaled shafts 30 and 31 adjacent both ends of thecompartments 8 and 9 respectively. Detents 32 mounted on the shafts 30near the ends of the latter are formed each with a tooth 33 on which oneof the corners of a carrier may rest. Near the upper end of each detent,a bracket 34 is fixed to the girder 4 and is equipped with a slidablerod 35 having one end pivotally attached as at to the upper end of theThe rod is surrounded by a compressed spring 37 hearing against thisother end and a flange 38 on the bracket, whereby to push the detentinwardly of the compartment.

The shafts 31 support intermediately pivoted dogs 39 near the endsthereof. The upper end of each dog is notched as at 40 for receiving oneof the lower edges of a earlier. It will be seen in Figure 6 that thesets of retaining members 32 and 39, although differently mounted ontheir shafts 3'0 and 31'enga'ge the carriers in the same plane. I

The members 18 support longitudinal bars 40 on the'upper edges thereof,and these bars are provided each with a longitudinal angle iron 41 asshown in Figures 5 and 6. The distance between parallel angle members isequal to the length of the base of a carrier .so that a carrier isclosely fitted and guided therein as shown in Figure 5. The bars 40 inline with the chamber 8 are formed with transverse guide members 42. Ineach guide member is slidably mounted a plunger 43 having a longitudinalslot 44 permitting movement "past a pin 45 in the guide member. Theplunger is normally moved outwardly along the inner edge of thecorresponding dog 39 by a spring 46 bearing against the inner end of theplunger and against a plug 47 in the inner end of the guide member.

The carriers are arranged in vertical series in the compartments 8 and9, and these series are guided vertically in the 1-members shaft 31thereof.

2 and 3 as may be seen by reference to Figure 3. The carriers aremaintained in proper lateral alignment by means of their cooperatingridges 23 and grooves 24.

For the purpose of describing the operation, let it be assumed that thecolumns of carriers are arranged as in Figure 1 wherein the elevator 14supports the lowermost carrier in the compartment 8 while the elevator15 has no load. The lowermost carrier in the compartment 9 rests on theupper ends of the dogs 39. Both elevators now rise together. Theslidable plungers 43 which are moved upwardly by the elevator 14 tend tohold the dogs 39 in engagement with the superposed carrier until,passing the pivot Even when these dogs pass upwardly beyond the pivotshaft, the weight of the column of carriers on the dogs is sufficient tohold the latter against movement to release position. Therefore, theelevators are caused to lift the columns slightly, whereupon the'plungers 43 .move the dogs 31 from beneath the carriers in the chamber9.

During this upward movement of the elevators, a carrier is raised by theelevator 14, and consequently the entire column in the chamber 8 israised. This column may therefore be designated as the ascending column,and the other as the descending column. The said lowermost risingcarrier on the elevator 14 has its inclined end faces 25 in engagementwith the teeth 33 of the detents 32, whereby these teeth are withdrawnfrom the bottom of the column. The

ascending column as well as the descending column is lifted slightlybeyond its plane of support on the dogs, and this increment of travelpermits the detents 32 to be moved inwardly by the springs 35 to takethe lowermost carrier in chamber 8 from the elevator and thus supportthe entire ascending column.

Both elevators now descend together. The elevator 14 drops without aload since the ascending column is supported by the detents 32. Theelevator 15 however now supports the descending column since the dogs 39have been moved away as already described. As the descending column islowered, the plungers 43 engage the dogs '39 which are also permitted toswing inwardly at their upper ends because of the inclined faces at theends of the carriers. When the plungers pass beneath the pivot shafts31, the dogs 39 commence to return to locking position in order tosupport the descending column after it has dropped the height of onecarrier. l/Vhen the elevator, 15 has reached its lowermost position, thecarrier thereon is rolled into the space beneath the ascending column.The lower ends of the intermediate girders 3 and baffle 7 are cut aweJ-as at 48 to permit this movement, and

the angleirons 41' confine the horizontally.

mounted in cylinders 50 at the end of the.

chamber 9 as shown in Figures 1 and 5. The rods are guided in bushings51 secured to the girders 2 and are adapted to pass through thesegirders in order to engage the carrier under movement. The relativeposition of the columns after a carrier has been moved from compartment9 to compartment 8 is illustrated in Figure 7.

Both elevators now rise, as already described, and their upper positionis shown in Figure 8. The descending column is dropped while theascending column is supported, as also described above, and at the endof this movement, the upper member of the ascending column istransferred to the top of the descending column by another ram assembly52 supported at the proper level. To permit this movement of the uppercarrier, the intermediate girders 3 and baffle 7 are shortened as at 58with respect to the corner girders 2. r

It will be apparent that a continuous cycle of the carriers up anddown'the oven is thus established. 7 The grids 22 may be permitted torise and descend as many times as neces sary for the proper treatment ofthe articles carried thereby. At the end of the treatment the grid isremoved from the bottom of the descending column as show in Figure 9,and a grid of fresh material is entered at the bottom of the ascendingcolumn as shown in Figure 7.

The movement of the transferring rams must be synchronized with theoperation of the elevators, and these elements may be controlled bysuitable automatic devices such as clock-controlled switches. Since theconstruction and arrangement of such devices are within the skill of amechanic confronted with a problem as stated here, it is 7 not deemednecessary to describe or illustrate them specifically. I I

The furnace 6 is heated in any suitable manner, as, for example, by ablower 54; which delivers hot air through dampers 55. A flue pipe 56 issubstantially co-extensive of the furnace wall in the vertical directionand communicates with the furnace at several points through pipes 57 Aby-pass 58 leading from the bottom of, the furnace to the blower permitsrecirculation of the'hot gases. Obviously any other suitable means forheating the furnace may be provided.

Although a specific embodiment of the invention has been illustrated anddescribed, it will be understood that various alterations in the detailsof construction may be-made without departing from the scope of theinvention as indicated by the appended claims.

Whatlclaimisnh" Y 1.- A'device for raising and lowering material in afurnace comp-rising ascending and descending columns of carriers mountedtherein, independent elevators mounted under each of said columns,pivoted detents mounted adjacent saidascending columns,

springs holding said detentsin a position where they engage said columnsin a manner permitting the same to be elevated and for holding saidcolumn against downward movement'when the elevator thereunder has 7 beenlowered,fdogs"pivoted intermediate 7 'theirends adjacent said descendingcolumns,

spring pressed plungers mounted upon the elevator beneath saiddescending column en;

gaging said dogs beneath their pivots and holding the upper ends thereofinto the path column, said plungers, being adapted to engage said dogsabove their pivots when said of the lowermost carrier in said descendingpermit the lowermost carrier in said column 7 to be lowered away fromsaid dogs.

2 A device for raising andlowering material ina furnace comprisingascending and descending columns of carriers mounted therein, elevatingmeans mounted under each of said columns, detents mounted adjacent saidascending column and adapted to engage the lowermost carrier carried bysaid elevator'to support said carrier when said elevator 1s lowered,dogs plvotedlnterme diate their ends adjacent said descendingcolumn',spring pressed plungers mounted upon the elevator beneath saiddescending column engaging said dogs beneath their pivots and holdingthe upper ends thereof into the path of the lowermost carrier in saiddescending column, said plungers being adapted to engage said dogs abovetheir pivots when said.

elevatorv moves upwardly to cause the upper ends of sald dogs-tomove-outwardly when the elevator raises the weight ofsaid 001 umn ofcarriers from said dogs and thereby permit the lowermost carrier in saidcolumn to be lowered away from said dogs.

. 3. A device for raising and lowering material in a furnace comprisingascending and descending columns of carriers jmounted therein, elevatingmeans mounted under each of said columns, detents mounted ad'- jacentsaid ascending column and adapted to engagethe lowermost carrier carriedby said elevator to support said carrier when said elevator is lowered,dogs pivoted'int'ermediate their ends adjacent said descending columns,spring pressed plungers mounted upon the elevator beneath saiddescending column engaging said dogs beneath their pivots and holdingthe upper ends thereof into the path of the lowermost carrier in saiddescending column, said plungers being adapted to engage said dogs abovetheir pivots when said elevator moves upwardly to cause the upper endsof said dogs to move outwardly from said dogs and thereby permit thelowermost carrier in said column to be lowered away from said dogs.

4;. A device for, raising and lowering material in a furnace comprisingascending and descending columns of carriers mounted therein,independent elevating means mounted under each ofsaid columns, detentsmounted adjacent said ascending column and adapted to engage thelowermost carrier in said column in a manner permitting additionalcarriers to be added to said column, dogs pivoted intermediate theirends adjacent said descending columns, spring pressed plungers mountedupon the elevator beneath said descending column engaging said dogsbeneath their pivots and holding the upper ends thereof into the path ofthe lowermost carrier in said descending column, said plunger-s beingadapted to engage said dogs above their pivots when said elevator movesupwardly to cause the upper ends of said dogs to move outwardly when theelevator raises the weight of said column of carriers from said dogs andthereby permit the lowermost carrier in said column to be lowered awayfrom said dogs, and a ram adapted to move said disengaged carrier fromsaid elevator to the elevator beneath said ascending column.

v5. A device for raising and lowering material in a furnace comprisingascending and descending columns of carriers mounted therein,independent elevating means mounted under each of said columns, detentsmounted adjacent said ascending column and adapted to engage thelowermost carrier in said column in a manner permitting additionalcarriers to be added to said column, dogs pivoted intermediate theirends adjacent said descending columns, spring pressed plungers mountedupon the elevator beneath said descending column engaging said dogsbeneath their pivots and holding the upper ends thereof into the path ofthe lowermost carrier in said descending columll, said. plungers beingadapted to engage said dogs above their pivots when said elevator movesupwardly to cause the upper ends ofsaid dogs to move'ou-twardly when theelevator raises the weight of said column of carriers from said dogs andthereby permit the lowermost carrier in said column tobe lowered awayfrom said dogs, and a ram adapted to move the topmost carrier from saidascending column to the top 01"" said descending column.

In testimony whereof I aiiix my signature.

WEDVVORTH V. BAKER.

